<?php

namespace DeliciousBrains\WPMDB\Common\DryRun;

class DiffInterpreter {

	/**
	 * @var DiffGroup
	 */
	private $group;

	/**
	 * @param DiffGroup $group
	 */
	public function __construct( DiffGroup $group ) {
		$this->group = $group;
	}

	/**
	 * Computes string difference and adds the entity to the group if diff exists.
	 *
	 * @param DiffEntity $entity
	 */
	public function compute( DiffEntity $entity ) {
		if ( 0 !== strcmp( $entity->getOriginalExpression(), $entity->getReplaceExpression() ) ) {
			$this->group->addEntity( $entity );
		}
	}

	/**
	 * post-find/replace procedures.
	 */
	public function finalize() {
		$this->group->finalize();
	}

	/**
	 * Returns array of diff entities with unmatching strings.
	 *
	 * @return DiffEntity[]
	 */
	public function results() {
		return $this->group->getEntities();
	}

	/**
	 * @return DiffGroup
	 */
	public function getGroup() {
		return $this->group;
	}
}